*	Fix - Strict Standards: Non-static method Pronamic_Gateways_IDealBasic_Listener::listen() should not be called statically
*	Fix - Strict Standards: Non-static method Pronamic_Gateways_OmniKassa_Listener::listen() should not be called statically
*	Fix - Strict Standards: Non-static method Pronamic_Gateways_Icepay_Listener::listen() should not be called statically